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We have 3 fermions (s=1/2) at the ground state of a harmonic oscillator moving over the x axis with a the classic hamiltonian for a three particle oscillator :

H =(1/2m)*(P1)^2 +((1/2)*m(w^2)((x1)^2)) +(1/2m)*(P2)^2 +((1/2)*m(w^2)((x2)^2)) +(1/2m)*(P3)^2 +((1/2)*m(w^2)((x3)^2))

we have a pertubation between fermions that is:

W=g*m*((w^2)/h)*(S1z*x2*x3+S2z*x3*x1+S3z*x1*x2).

And it is asked the chande of the ground state's energy due to the pertubation.

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# Harmonic Oscillator with fermions

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